What the heck is back button focus & why do I need to use it?

When most people make a photo with their camera, they aim, press the camera's shutter release button, wait for the camera to focus, then press the button the rest of the way. Whammo, the image is made.

While that's easy and direct, if you're using a DSLR (Digital Single Lens Reflex) or MILC (Mirrorless Interchangeable Lens Camera) camera, it may not be the best way to focus and shoot. Until 1989, it was the only way to activate autofocus and make a photo with an SLR (Single Lens Reflex) camera, the film based forbearer of today's DSLR and MILC cameras.

It wasn't until 1985 that autofocus was even available. That year, Minolta, having purchased Leica autofocus technology, released the first commercially successful autofocus SLR, the Maxxum 7000. Minolta configured the Maxxum autofocus system to work as most photographers know it today. Autofocus was activated by pressing the shutter release button.

Four years later, in 1989, Canon introduced back button focus. It removes the autofocus function from the shutter release button and assigns it to a button on the back of the camera. Hence the name, back button focus.

Daylight Savings Time and your Digital Camera

In most locations of North America, we are about to reset our clocks, moving the time forward one hour, in the “wee” hours of the morning, on Sunday, March 9^th, to begin “Daylight Saving Time,” or “Daylight Time.” In some parts of North America, such as the states of Arizona (except for the Navajo Nation lands there) and Hawaii in the US, and most of Saskatchewan in Canada, “Daylight Time” isn't used. They stay on “Standard Time” throughout the year.

North America isn't alone in the world moving it's time forward in the spring and back in the fall. Across the globe, 79 nations use “Daylight Time” in at least part of their country. The Falkland Islands stay on “Daylight Time” throughout the year. Most countries on Earth, 159 at this time, remain in “Standard Time” all year.

For those countries which use “Daylight Time,” the date on which “Daylight Time” starts and ends varies from country to country, set by government regulation or law. It also varies according to which hemisphere each country is located, north or south.

Since photography began, photographers have always been cognizant of the time of day, both because it can dramatically affect their work, both outdoors and inside, and for image documentation.
I hear the question, “When is the best time of day to shoot?” often. The answer is, of course, every time of the day is the “best” time to make photographs, as the light at these times can each set a particular mood, feeling, or tone, giving an opportunity to show the same scene in far different, and multiple “lights.”